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Contact: F.X.Timmes
my one page vitae,
full vitae,
research statement, and
teaching statement.
* The instrument public_ephem.tbz computes the state vectors for the major bodies of the solar system, two martian satellites, four Galilean satellites, eight of Saturn's moons, six Uranian moons, thousands of comets, and half a million asteroids.

The tool combines the JPL DE430 ephemeris, JPL osculatory orbital elements, and the Naval Observatory NOVAS positional astronomy package. The results thus compare favorably with those from JPL Horizons. A brief guide is in this README.

Xephem by Elwood Downey is excellent, open, and is a lot of fun. Starry Night is not free or open, but visually yummy.




* public_ephem.tbz contains seven data files:

unxp1950-2050.430 - JPL DE430 little-endian binary file for the major bodies in the solar system from 1950 to 2050. Most fortran compilers can convert to big-endian on-the-fly if desired, or visit JPL to roll your own binary files.

comet_elements.dat - JPL osculatory orbital elements for comets. Current as of 25Sep2019; get updated versions from the JPL small-body database.

numasteroids_elements.dat - JPL osculatory orbital elements for asteroids. Current as of 25Sep2019; get updated versions from the JPL small-body database.

ephem.e15 - J2000 parameters for the Galilean satellites; from Jay Lieske's article.

redtass7.dat - time series arguments for eight of saturn's satellites; from BDL.

leap_second.dat - (TAI - UTC) timescale offsets; get updated versions from IERS or IERS.

deltat.dat - (TT - UT1) timescale offsets; get updated versions from IERS or IERS.




* public_ephem.tbz contains twelve library files:

novas_routines.f90 -a semi-custom USNO NOVAS.
jpl_routines.f90 - read and interpolate JPL ephemeris files.
position_routine.f90 - returns the state vector.
ephem.dek - common block communications.
initialize_routine.f90 - initializations.
fxt_routines.f90 - state vectors to orbital elements and more.
marsat_routines.f90 - state vectors of the martian satellites.
lieske_routines.f90 - state vectors of the jovian satellites.
satsat_routines.f90 - state vectors of saturn's satellites.
gust86_routines.f90 - state vectors of the uranian satellites.
glue.f90 - string parsers, converters, and more.




* public_ephem.tbz contains 14 applications:

analemma.f90 - position of the sun to make an analemma.
conjunction.f90 - conjunctions, quadratures, and more.
ephem.f90 - combines several of the applications.
equinox.f90 - times of equinoxes and solstices.
moon_phases.f90 - lunar events including eclipses.
orbit.f90 - state vectors over time.
perihelion.f90 - times of apheleions and periheleions.
position.f90 - state vectors in different coordinate systems.
retrograde.f90 - times of retrograde motion.
rise.f90 - rise, transit, and set time of any object.
solar_eclipse.f90 - track of a solar eclipse centerline.
sunrise.f90 - quicky rise, transit and set of the sun and moon.
sunrise_over_year.f90 - the sun over a year.
within.f90 - times of objects within a given angular seperation.




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Please cite the relevant references if you publish a piece of work that use these codes, pieces of these codes, or modified versions of them. Offer co-authorship as appropriate.